Let's get Nosey!
Did you know that the human nose has more than 60 distinct functions that can directly impact growth and development, sleep, and overall well-being?
One of the most powerful aspects of learning is how personal it becomes. As you begin to understand how your nose works, you may discover connections to your own breathing, sleep, energy, and health that you have never considered before. But before that journey begins, I’d like to share the clinical foundation behind my work.
I’ve had the privilege of helping advance 4-phase rhinomanometry (4PR), the most detailed objective test of nasal function, through my work with the late Dr. Klaus H. Vogt, my mentor, friend, coauthor, the inventor, the pioneer, and father of the modern-day, computerized multi-phase rhinomanometer. My work continues his legacy of sixty years by translating advanced airway science into practical, clinically meaningful insights. It was my promise to him during our last chat before he passed. Some would call me the mother of the modern day rhinomanometer.
This platform is dedicated to educating both clinicians and the public on nasal function and resistance as critical biomarkers of health. These factors influence craniofacial growth, autonomic nervous system balance, chewing and swallowing, sleep quality, cognitive performance, dental/orthodontic alignment, and systemic health. When nasal resistance exceeds your optimal range, it can alter airflow dynamics and pressure dynamics and relationships within the airway and body, affecting growth, treatment monitoring, clinical decision-making, and our long-term health outcomes.
My focus is on bridging airway physiology and real-world care through concepts such as nasal resistance, slow airflow hypoxia (SAH), and the neuro-respiratory connection. These are not abstract ideas; they are measurable physiologic factors that influence how we breathe, how we sleep, and how the entire body functions.
Did you know there are hundreds of factors that influence nasal resistance and how your nose works? Yes! Over 500 that I have discovered, and still counting.
Whether you’re here to explore nasal function as the “Fifth Vital Sign,” learn more or find guidance as a patient to manage nasal function and testing resistance, or a practitioner who is looking to learn from the inventors and get certified in airway function diagnostics, you are in the right place. I am honored to guide you.
Breathe easy, Sleep well!™
Dr. Karen
- Breathe Easy, Sleep Well™
Welcome to The Airway Corner
What if you were told it’s not just how you breathe, but the amount of airway resistance required to breathe?
No two noses are alike—not even in identical twins. Like a fingerprint, each person has a unique nasal resistance profile. As resistance changes, the body may adapt in subtle, cumulative ways that are often invisible but objectively measurable. So, what is “normal” nasal function? It’s complicated. The goal is not simply normal function—it’s optimal function. This is the gap Dr. Davidson set out to solve nearly a decade ago, and what has made her a global expert in her field.
Through research and analysis of thousands of 4PR tracings and objective measurement datasets, Dr. Davidson identified novel airway phenomena, more than 500 variables influencing nasal function, and new approaches to rhinopathia endotyping, phenotyping, and genotyping. She developed IP-driven algorithms that translate nasal resistance data into meaningful functional insights and clinical decision intelligence.
Nasal resistance is more than a symptom—it is a unique biophysical signal, a potential “Fifth Vital Sign.” Through The Airway Corner™, she advances airway health through research, education, consulting, and innovation—one airway at a time.
Dr. Davidson’s work is inspired by her clinical experiences and her son, Zach, whose journey overcoming sleep and airway issues motivates her every day.
“We don’t just breathe, we breathe against nasal resistance, and that resistance shapes our anatomy and physiology.” Dr. Karen
Airway Clinic & Provider Mentoring
Clinical Insights into Nasal Function & Resistance as Biomarkers of Health™
Personalized Nasal Health Insights, Wherever You Are
In Office Visits
- Comprehensive Exam
- Advanced Technology
- Device Fitting with 4PR
- Global Expert Access
- Treatment Planning
- NEW! Functional Medicine
Telehealth Visits
- Virtual Consults
- Test Interpretations
- Treatment Planning
- Patient Support
- Parent Support
- NEW! Functional Medicine
Clinical mentoring, Education, and Industry Consulting
provider Mentoring
- Advanced Nasal Function Training & Certification
- Clinical Integration
- Research Partnership
- Group Training- The FACT Method™, Data Interpretation
Airway Industry
- Clinical Consulting, Courses & Certification
- Product Testing w/Airway Diagnostics
- Research Requests
- Speaking Requests
Guest Lectures
Join the Conversation!
Welcome to the Let’s Get Nosey™ Podcast, where the airway isn’t an afterthought—it’s the starting point for understanding health.
With nearly four decades in healthcare and extensive experience in critical care, ENT, sleep medicine, flight medicine, OR, medical devices, pharmaceuticals, and airway diagnostics, Dr. KPD brings the science, experience, and real-world perspective to the conversation
“If you want to understand the body,
you have to start with the nose.”
Here, we cut through the BS, myths, misinformation, and social-media hype surrounding airway health. We look at what the evidence actually says, challenge outdated thinking, separate what sounds good online from what can be measured, understood, and supported by science and clinical experience, and probably upset the apple cart.
Real science. Real cases. Real conversations. No hype. No fluff. Just the nose—real and raw.
So if you’re ready to rethink nasal function, sleep, and what you thought you knew about airway health . . . . .
Let’s Get Nosey!™
Questions About Nasal Function?
Get Expert Support from Dr. Karen Parker Davidson, RN
Hello & Welcome!
Pull up a chair, grab a cup of coffee, and let’s chat about something a little different: nasal function. Sleep and breathing topics are everywhere, so instead, I like to focus on the nose itself, the gateway to so much of our health. In fact, I authored the first two books on nasal function available to the public, offering a new perspective and clinical guidance to the field, available online or at a bookstore near you!
My journey began in 1983 in a small respiratory therapy program. After a brief flirtation with lung physiology and then veterinary medicine (I quickly realized I wasn’t cut out to be Dr. Doolittle), I found my way to nursing. In 1988, I left Northeast Ohio and transferred to UNC–Chapel Hill. By 1991, during my senior year, I gained hands-on experience as a nurse extern in the PACU at UNC Hospitals, envisioning a future as a Nurse Anesthetist (CRNA). I quickly learned that managing a pediatric airway is very different from managing an adult airway. It was Carolina, and on game days, you could find us sneaking away from studying to catch the action at the Dean Dome, Keenan Stadium, or along Franklin Street.
Shortly after, I became the first new graduate nurse (RN) in the PACU at MUSC in Charleston, SC, and in 1993, I was commissioned as an officer in the U.S. Air Force Reserves. Traveling the world was incredible, but serving as a Flight/ICU nurse during various operations and missions, including Operation Enduring Freedom (2001), Operation Iraqi Freedom (2003), and others opened my eyes to the realities of practicing under extraordinary pressure and conditions, and how much, and quickly the environment can influence airway function and the next breath.
Over the years, I’ve worn what seems too many hats. In 2017, I brought the NR6 4-phase rhinomanometer to the North American market in my executive role. By 2019, I introduced 4PR to the dental community and beyond, further empowering clinicians to measure and understand nasal function in ways never before possible. In 2022, proprietary data interpreation software DAFNE Score and training courses launched.
For some, it takes a bit longer to find our true passion, but when we do, it lights the way of our path. For me, every patient, every measurement, every insight, and discovery is an opportunity to improve the quality of life—one breath at a time.
100+ Publications, Lectures & Professional Guest Appearances Discussing Nasal Function & Resistance
More than 40 government registered works & Innovation in Nasal function and Airway science
40 Years of Clinical & Research Experience; nearly 30 years of Medical Device Experience in ENT, Sleep, Critical Care & Aerospace Medicine.
20+ Collaborations & faculty positions with Medical & Dental Experts
Start Your Airway Journey
Clinical Consultation
Schedule a 30-minute consultation for a second opinion, support, or to review the next steps in your or your child’s treatment plan.
Initial Assessment
Your first session is a comprehensive evaluation using proprietary tools and testing to build a personalized care plan.
Ongoing Support
Regular follow-ups help track progress and guide lasting improvements in airway function and total health.
Hear From Those Who Breathe Easier
10.5k+ Patients, Providers, and Researchers Worldwide Impacted by Dr. Karen in the Last 10 Years
Resources
“An inflamed nose is not a symptom, it’s a signal!” Your well-being starts with knowledge. Explore trusted tools and organizations that support nasal health, better breathing, and overall wellness. Click “Request a Call” below to discover recommended guides and professional resources curated by Dr. Karen.
- Nasal & Airway Function Education Center
- Sleep & Breathing Support Programs
- Airway Health Professionals Network
- Patient Wellness & Care Resources
- FACT Method™
- Nasal Resistance and Airway Systems Curriculum™
- Coming Soon! New Holistic and Functional Medicine Platform
